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Estimation of POC Export Fluxes Using 234Th/238U Disequilibria in the Amundsen Sea, Antarctica

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dc.contributor.authorKim, Mi Seon-
dc.contributor.authorChoi, Man Sik-
dc.contributor.authorLee, Sang Heon-
dc.contributor.authorLee, SangHoon-
dc.contributor.authorRhee, Tae Siek-
dc.contributor.authorHahm, Doshik-
dc.coverage.spatialAmundsen Sea-
dc.date.accessioned2017-08-03T14:09:33Z-
dc.date.available2017-08-03T14:09:33Z-
dc.date.issued2014-
dc.description.abstractIn order to understand the carbon cycle in the Amundsen Sea o f the Southem Ocean, the export t1uxes o f particulate organic carbon from the euphotic zone to deep water estimated using <sup>234</sup>Th<sup>238</sup>U disequilibrium method. Seawaters in 14 water columns were collected during February and March 2012, and analyzed for total and dis- solved and organic carbon. Total <sup>234</sup>Th activities in the water column showed deficiency and excess relative to those of <sup>238</sup>U depending on the water depth. Deficiency of total in the euphotic zone showed mirror images both with chlorophyll-a and f1uorescence, and was consistent with the loss of nitrate, which indicated the effect ofbiological activity. In addition,deficiency of total <sup>234</sup>Th from deep water was associated with the increase oftotal dissolvable Fe/Mn concentration. Excess total <sup>234</sup>Th activity below the euphotic zone might be related to <sup>234</sup>Th concentrated in this water depth. Mean export flux of <sup>234</sup>Th estimated using the steady state model was 867 ± 246 dpm m<sup>-2</sup>day<sup>-1</sup> Mean export flux of particulate organic carbon, which were estimated by the product of total <sup>234</sup>Th flux and ratio of POC/<sup>234</sup>Th (7.08 ± 4.27 umol C dpm<sup>-1</sup>)in the sinking particles, was 5.9 ± 3.9 mmol C m<sup>-2</sup>day<sup>-1</sup>. These fluxes were similar levels to those in the Weddell Sea during February and March 2008. Export ratios (ThE) relative to the primary production in the euphotic zone were in the range o f3-54% (av. 28%).-
dc.languageKorean-
dc.subjectOceanography-
dc.subject.classificationAraon-
dc.titleEstimation of POC Export Fluxes Using 234Th/238U Disequilibria in the Amundsen Sea, Antarctica-
dc.titlePreliminary Result-
dc.typeArticle-
dc.identifier.bibliographicCitationKim, Mi Seon, et al. 2014. "Estimation of POC Export Fluxes Using 234Th/238U Disequilibria in the Amundsen Sea, Antarctica". <em>「The Sea」Journal of the Korean Society of Oceanography,</em>, 19: 109-124.-
dc.citation.title「The Sea」Journal of the Korean Society of Oceanography,-
dc.citation.volume19-
dc.citation.page109-124.-
dc.identifier.doi10.7850/jkso.2014.19.2.109-
dc.coverage.x74°S-
dc.coverage.y125°W-
dc.subject.keywordAmundsen Sea-
dc.subject.keyword234Th/238U disequilibria-
dc.subject.keywordParticulate organic carbon export flux-
dc.subject.keywordExport efficiency-
dc.subject.keywordAraon-
dc.coverage.degreeX-74-
dc.coverage.degreeY-125-
Appears in Collections  
2014-2016, Physical and Bio-Geochemical Processes in the Amundsen Sea / Lee; Sang H. (PP15020; PP16020; PP14020)
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